Asian characters detection

NSString+CJK.h

#import <Foundation/Foundation.h>


@interface NSString (CJK)

/**
 Detect if the string contains Chinese, Japanese or Korean characters
 
 @return YES if the string contains CJK characters, NO otherwise
 */
- (BOOL)containsAsianCharacters;

@end

NSString+CJK.m

#import "NSString+CJK.h"


@implementation NSString (CJK)

- (BOOL)containsAsianCharacters
{
    if (![self length])
        return NO;
    
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"[\u2E80-\u9FFF]" options:NSRegularExpressionCaseInsensitive error:nil];
    return ([regex matchesInString:self options:0 range:NSMakeRange(0, [self length])]);
}

@end